Radicale

At a glance

• Editor score
  3.0 / 10
• Pricing
  Free plan
• Best for
  Technical users self-hosting calendar infrastructure
• Free plan
  Yes
• Paid from
  Free
• Facts checked
  22 Sep 2026

• Where it wins

  • Supports CalDAV calendars and CardDAV contacts with two-way sync
  • Includes sharing, authentication, authorization controls, and TLS
  • Free GPLv3 software with filesystem storage and plugin extensibility

• Where it doesn't

  • Requires self-hosting and infrastructure management
  • No native mobile app is provided
  • Integration options are not established beyond supported client protocols

Our verdict on Radicale

Radicale is a free, open-source server for calendars, contacts, to-do lists, journal entries, and business cards. It is designed for technical users who want to manage their own calendar and contact infrastructure rather than adopt a hosted, end-user calendar service. Data can be shared through CalDAV, CardDAV, and HTTP, with support for multiple calendar and address-book collections. Desktop, web, and Android clients can connect to the server, while a web interface provides management for calendars and address books.

Its strongest fit is protocol-based interoperability. CalDAV enables calendar synchronization, while CardDAV supports contacts, and the server handles events, to-do lists, journal entries, and business cards. Calendar and contact sharing through HTTP broadens access across supported clients. Authentication and authorization controls help administrators manage access, and TLS-secured connections protect traffic between clients and the server. Plugin extensibility adds room for tailored deployments, although the product remains infrastructure rather than a ready-made productivity suite.

The trade-off is operational responsibility. Filesystem-based storage and self-hosting give administrators control over deployment and data management, but they also require technical ownership of the server environment. Radicale does not provide a native mobile app, so users connect through compatible clients, including Android clients. It is a strong choice for organizations and individuals comfortable managing open-source infrastructure and wanting standards-based calendar and contact services. Those seeking a polished hosted calendar with built-in mobile applications or a broad, established integration ecosystem should choose a different type of product.

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Radicale pricing

Radicale fact sheet

Alternatives to Radicale

• Google CalendarA versatile calendar for personal schedules and Google Workspace collaboration.9.4
• Microsoft OutlookA flexible calendar choice for people and teams already working in Microsoft’s ecosystem.9.2
• Zoho CalendarA low-cost calendar with booking, sync, room reservations, and broad integrations.9.1

See all Radicale alternatives →

Featured on iTechGuides

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update